There's an interesting line drawn in the sand between smartphone users and smartphone makers: for the longest time, many companies thought users wanted the thinnest, lightest phones on the planet (and for a time, I think they may have actually been right). But now, that's not how it is. Users don't care how thin their phone is most of the time — they just want it to last all damn day. All-day longevity translates in one way when it comes to form factor: thicker and heavier. That's basically the opposite direction the industry was heading up until recently, and now we're finally starting to see large batteries show up in phones.